Best Suppressors for the FN PS90 (5.7x28): What Fits and Why

Why the PS90 is a good suppressor host

The FN PS90 is a bullpup, so the barrel sits far back in the gun. Even with a can on the end, the whole rifle stays shorter than most AR carbines.

The 5.7x28 round is small and uses little powder, which makes it easy on a suppressor. Keep one thing in mind: from the factory 16 in barrel the bullet is supersonic, so you will still hear the crack of the bullet in flight. A suppressor cuts the muzzle blast, not that crack.

Step one: the muzzle

The factory 16.04 in barrel is not threaded for standard muzzle devices. In the PS90 Studio, choosing any muzzle device or suppressor adds a Dorin threaded barrel shroud (about $199) that gives you 1/2x28 threads.

If you pick the CMMG 10.4 in barrel instead, the studio adds a CMMG thread adapter (about $35) to go from M12x1 LH to 1/2x28. A barrel under 16 in on a stocked rifle makes it a short-barreled rifle under the NFA, so read the legal section below first.

Whatever you use, make sure the threads are straight and the can is centered on the bore. Many owners check this with an alignment rod before the first shot. A can that is off-center can be damaged by a bullet strike.

What "5.7 rated" means

5.7x28 bullets are .224 in wide, the same as 5.56. That means three families of cans can work, but they are not equal.

5.56 rifle cans: built for far more pressure than 5.7x28 makes. Many makers do not list 5.7 by name, but the caliber is well inside what they handle.
9mm cans: the bore is big enough, but the gas pressure and speed of 5.7 are different from 9mm. Only use one the maker lists as rated for 5.7x28.
.30 cal cans: they work, but the larger bore is less efficient on a small bullet and they tend to be heavier. Fine if you already own one.

Picks that fit

These are all in the PS90 Studio. The studio marks which ones the maker rates for 5.7x28.

Liberty Mystic X (about $595): the cheapest can on the list, rated for 5.7x28, and it threads straight onto 1/2x28. It is long at 8 in.
HUXWRX Flow 9K Ti (about $679): tiny at 5.3 in and under 5 oz, rated for 5.7x28. You need a fixed-barrel spacer or direct-thread adapter, sold separately.
Banish PSTL 9 Ti (about $899): rated for 5.7x28, under 7 oz, and also works on 9mm pistols and carbines.
SilencerCo Omega 36M (about $993): rated from 5.7x28 up to .338 rifles and can run short or long. A good one-can-for-everything choice if you need a mount for each gun.
Griffin Armament Recce 5 (about $660): a stainless 5.56 can with a taper QD mount and a 1/2x28 brake in the box.
SilencerCo Saker ASR 556 (about $797): tough stainless build with a 1/2x28 flash hider included. Heavy at almost 17 oz.
Banish 223 (about $749): titanium 5.56 can under 10 oz that direct-threads onto 1/2x28.

Direct thread or quick-detach

Direct-thread cans screw onto the barrel threads. They are simple, short and cheap, which suits a single-purpose PS90 can.

Quick-detach cans clamp onto a muzzle device such as a flash hider or brake. They come on and off faster and can move between guns that wear the same mount, but the mount adds length and cost. If the PS90 will be the only host, direct thread is usually the better deal.

Legal basics

Suppressors are NFA items. In October 2026 ATF said it would stop enforcing NFA registration for suppressors and short-barreled rifles after federal court rulings, and the federal tax on them is $0 in 2026. That is an enforcement policy, not a repeal, so it could change. Background checks and other Gun Control Act rules still apply, and many states restrict or ban suppressors outright.

Short-barreled rifles follow the same new policy, but taking one across state lines still needs ATF Form 5320.20. Check current federal law and your state and local law before you buy or install anything, and ask a firearms attorney if you are unsure.

Try it in the studio

Open the PS90 Studio, pick a suppressor under Muzzle device, and the parts list adds the threading part you need. Prices are rough street prices and change often, so check current listings before you buy.

Parts in this guide

Liberty Mystic X (9mm can)

$595 · Muzzle device

HUXWRX Flow 9K Ti (9mm can)

$679 · Muzzle device

Banish PSTL 9 Ti (9mm can)

$899 · Muzzle device

SilencerCo Omega 36M (9mm can)

$993 · Muzzle device

Griffin Armament Recce 5 (5.56 can)

$660 · Muzzle device

SilencerCo Saker ASR 556 (5.56 can)

$797 · Muzzle device

Banish 223 (5.56 can)

$749 · Muzzle device

Open the FN PS90 builder

Prices are typical and change often. This guide is general information, not legal advice. Suppressors and short-barreled rifles are NFA items; check federal, state and local law.